Heating device

Patent metadata

Field	Value
Publication number	US-11317477-B2
Application number	US-201916354946-A
Country	US
Kind code	B2
Filing date	Mar 15, 2019
Priority date	Mar 19, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Disclosed is a heating device comprising a plate-shaped ceramic PTC resistor having a thickness, a front side, a back side and narrow sides, wherein the distance from the front side to the back side equals the thickness, and a first contact element and a second contact element, which are electrically contacting the PTC resistor. The PTC resistor is electrically contacted by the contact elements on opposite narrow sides.

First claim

What is claimed is:

1. A heating device, comprising:
a plate-shaped ceramic PTC resistor having a thickness, a front side, a back side and narrow sides, wherein the distance from the front side to the back side equals the thickness;
a first contact element electrically contacting the PTC resistor on a first one of the narrow sides; and
a second contact element contacting the PTC resistor on a second one of the narrow sides opposite the first narrow side.

2. The heating device according to claim 1 , comprising an electrically isolating frame holding the PTC resistor and the contact elements.

3. The heating device according to claim 2 , wherein the contact elements are embedded in the frame.

4. The heating device according to claim 3 , wherein the contact elements are embedded in the frame by insert molding.

5. The heating device according to claim 1 , wherein the PTC resistor comprises a plurality of plate-shaped ceramic PTC resistors arranged in a row and electrically contacted on opposite narrow sides thereof.

6. The heating device according to claim 1 , comprising a tube in which the ceramic PTC resistor and the contact elements are arranged.

7. The heating device according to claim 1 , wherein the electrical contact elements are formed of strips of sheet metal.

8. The heating device according to claim 7 , wherein the contact elements comprise bent rim sections that electrically contact the PTC resistor.

9. The heating device according to claim 1 , wherein the electrical contact elements press resiliently against the narrow sides of the PTC resistor.

10. The heating device according to claim 1 , wherein the narrow sides of the PTC resistor are covered by a metallic layer.

11. Air heater comprising several rod-shaped heating devices according to claim 1 , wherein the rod-shaped heating devices are arranged side by side and cooling fins are arranged between neighboring rod-shaped heating devices.

12. The heating device according to claim 1 , wherein the heating current is configured to flow across the width of the PTC resistor.

Assignees

• Borgwarner Ludwigsburg Gmbh

Inventors

• Mccarthy Cian
• O'Carroll Thomas
• O'Sullivan Katherine
• Sweeney Stephen
• Morris Ivan
• Dukes Kevin

Classifications

• F24H9/1872 Primary

  PTC resistor · CPC title

• H05B2203/023

  Heaters of the type used for electrically heating the air blown in a vehicle compartment by the vehicle heating system · CPC title

• H05B3/141

  Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds · CPC title

• H05B2203/02

  Heaters using heating elements having a positive temperature coefficient · CPC title

• H05B3/50 Primary

  heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins · CPC title